How It Works

Cofactor for 5α-reductase (T → DHT conversion). Required for androgen receptor function. Component of Cu/Zn-SOD (antioxidant). Zinc finger proteins in DNA repair. Inhibits aromatase (reduces T → estradiol conversion at high doses).

Dosage & Timing

Dosage Guide

Daily Dose15-40 mg

TimingWith food (reduces nausea). Avoid with high-calcium meals. Evening preferred by some (sleep effect).

BioavailabilityPicolinate: ~60%. Glycinate: ~55%. Citrate: ~50%. Oxide: ~20% (avoid). Phytates (grains/legumes) reduce absorption ~50%. Take away from high-phytate meals.

Optimal Timing

With food to prevent nausea. Avoid with high-calcium meals. Evening may improve sleep quality. Separate from iron supplements by 2+ hours.

Blood Markers to Monitor

Serum Zinc
Copper (monitor for depletion with long-term zinc)
Alkaline Phosphatase (zinc-dependent enzyme)

Deficiency Symptoms

Frequent colds
Slow wound healing
Acne
White spots on nails
Reduced taste/smell
Hair thinning
Low libido

Cycling & Duration

No cycling required — safe for continuous daily use.

Best Forms (Ranked)

Zinc Picolinate — ★★★★★

Excellent absorption. Well-tolerated. Most researched for T support.

Zinc Glycinate — ★★★★★

Gentle on stomach. Good absorption. Chelated form.

Zinc Citrate — ★★★★☆

Good absorption. Slightly more GI effects than glycinate/picolinate.

Zinc Oxide — ★☆☆☆☆

Poor absorption. Cheap but ineffective. Avoid for supplementation (good for sunscreen though).

Evidence-Based Benefits

Testosterone increase (if deficient)
Reduced cold duration (lozenges at onset)
Acne reduction (anti-inflammatory, anti-androgenic)
Improved sperm quality
Wound healing
Reduced inflammation (CRP reduction)

Side Effects & Safety

Nausea on empty stomach
Copper depletion with long-term high dose (>50mg/d)
Reduced HDL at very high doses
Metallic taste
Loss of smell (rare, with zinc nasal sprays only)

✅ Good For

Athletes (sweat losses, immune stress)
Men with low T symptoms
Acne-prone individuals
Frequent sickness
Vegetarians/vegans (phytates, lower intake)

⚠️ Skip If

Those with Wilson disease
Already supplementing high-dose zinc (check total intake)

Stacks Well With

Magnesium (sleep + hormone synergy) Vitamin D3 Copper (if long-term Zn use) Boron

💊 Zinc